Dyestuffs containing chromium and process of making same



Patented Jan, 17,1928.

UNITED STATES FRITZ STBAUIB, GUILLAUME DE MONTMOLLIN, JOSEPH SPIELER, AND GHRISTOPH VON- PATENT OFFICE.

I'LANTA, OIF BASEL, SWITZERLAND, ASSIGNORS T0 SOCIETY OF CHEMICAL INDUS- TRY IN BASLE, 0F BASEL, SWITZERLAND.

DYESTUFFS CONTAINING CHROMIUM AND PROCESS OF MAKING SAME.

No Iwrawing'. Application filed June 1 1925, Serial No. 34,199, and in Switzerland June 17, 1924.

agents yielding chromium, as for instance chromium oxide or a hydrate or salt thereof, ortho-hydroxy azodyestuiis corresponding with the general formula O Ri N N- IlH no I wherein lit, stands for any aromatic nuclafs carrying besides at least one nitrogroup one (DH- roup in ortho position to the azobridge, R meaning O-alkyl or NH-aryl. The new products, which are the chromium derivatives of the above specified dyestuffs form. in a dry state, greenish-yellow to brownish-red and orange powders, dissolving in water to yellow, orange and brown solutions, dyeing wool in an acid bath from yellow to orange and brown tints of excellent properties of fastness. In some cases, there are also ob: tained dyestuifs which may successfully be ployed for other purposes, as for instance chrome printing.

Ewample 1.

29.5 parts of the azo-dyestud made from t-nitro-2-amino-1-phenol and aceto-acctic acid ethylester corresponding probably with the formula:

are suspended in 900 parts of water and there corresponding with 22.5 parts of C50,, and the whole is boiled for a long time'in a reflux apparatus. After cooling, dilute caustic soda solution is added until the liquid has a caustic alkali reaction. Themixture is stirred for some time and filtered; from the filtrate the dyestuif containing chromium is salted out. It is a yellow brown powder, soluble in water to a yellow solution and in dilute caustic soda solution to an orange solution. It dyes Wool in a sulfuric acid bath very uniform, fast reddish yellow tints.

Emample 2,

An aqueous solution containing 44.4 parts of the sodium salt of the dyestufi from 4- nitro-Q-amino-l-phenol-6-sulfonic acid and aceto-acetic' acid ethylester and chromium formate, corresponding with 22.5 parts of Cr O is boiled for a long time in a reflux apparatus. The liquid is then in part evaporated and the dyestulf containing chromium is isolated by salting out. It is an olive brown powder, soluble in water to a yellow solution and in'dilute caustic soda solution to an orange solution. It dyes wool in a sulfuric acid bath very uniform reddish-yellow tints of remarkable properties of fastness.

By substituting another chroming agent, such as chromium fluoride, for the chromium formate a like dyestufi is obtained.

Example 3.

44.4 parts of the sodium salt of the dyestuff from 4-nitro-2-diazo-1-phenol-6-sulfonic acid and aceto-acetic acid anilide corresponding probably with the formula:

are dissolved in 1000 parts of water; a solution of chromium fluoride corresponding lows: parts of the finelypowdered dyewith 22.5 parts of Cr O is then added and stuff are dissolved in a mixture of parts the whole heated for some time at the boil/of sulfuric acid monohydrate and 500'parts ing temperature after addition of 10 parts of glass powder. The solution is then concentrated by partial evaporation and the new product precipitated by addition of common salt. It forms a brown powder, dissolving in water with yellow coloration and dyeing wool golden-yellow level tints of excellent properties of fastness. If, instead of chromium fluoride, other agents yielding chromium are employed such as for instance chromium formate, a dyestutf of analogous properties is obtained. 1

Example 4.

50 parts of the sulfonated product obtained by combining 2-diazo4-nitro-1-phenol- 6-carboxylic acid with the anthranilide of aeeto-acetic acid are dissolved in 1000 parts of water and treated at the boil for several hours with 26 parts of chromium formate. The chromium compound is isolated by addition of common salt to the solution previously concentrated by evaporation. It forms a brown powder, dissolving in water with yellow coloration, and dyeing wool yellow tints; when printed on goods with chromium mordants, it yields pure and fast greenish-yellow tints.

The sulfonated dyestufl' is obtained as folof fuming sulphuric acid (containing 25% of SO) and the mixture is mixed for some time at ordinary temperature. The whole is then poured on ice, the dyestuff is filtered, dissolved in water to which an alkali has been added, and precipitated from its solution rendered slightly alkaline by addition of acid by means of common salt. The new dyestuif forms an orange powder, dissolving in water to a yellow solution. Dyed directly or atterchromed it yields on wool yellow tints.

The arylide from aceto-acetic acid and anthranilic acid may be prepared as follows: 189 parts of anthranilic acid are dissolved in 2000 parts of benzene, 132 parts of acetoacetic acid ethylester are then added at boiling temperature and the whole is heated further for some time. The solvent is then distilled oil and the residue treated with hydrochloric acid of 10% strength which dissolves the anthranilic acid, whereas the anthranilide of the aceto-acetic acid remains undissolved forming a crystalline powder. Crystallized from hot water the new product melts at 150 C.

The following table shows the properties of some of the new chromium compounds:

' Tint obtained by k Color of the a ue- Derivative of acetoacetic acid Diazotizetion component Color the dyesmfi a one solutioii o! dyemg or the drystate h dyestufl in an t e dyesmfi acid bath Aoetoacetic acid ethylester. 4-nitro-2-amino-1-phenol Brownish-yellow powder Yellow Yellow Acetoeceticecid amlide 4-methyl-6 n1tro:2-amino-1-phenol Orange powder Yellow Yellow 4, 6din1tro -2-am1no-1-phenol Brown Brownish-yellow Brown Nitrated diazo derivative of i-amino- Brown Brown Reddisli-hrown Z-naphthol-Mullonic acid Appoeeetic acid 2-chloro-animangled-phenol6-nitro-4-sullonic Yeliowish-brown powder Orange-yellow Orange-brown e v as 1 I Acetoagetic acid, 2,4-dicl1loro- 2411p;no-l-phenol-tchloro-B-sulfonic Orange-brown Orange Orange anili e ac Acetoacetic acid o-xylidide Nitrated diazo derivative of l-aminm Brown Orange Brown 2-naphthol-4-sulfonic acid y Aeetoacetic acid m-xylidide- Reddish-brown Reddish-brown Reddisirhrown flullonejaeid1 aoetoacetlc acid 4 mtro-2-ammo-1-phenol Orange Orange-yellow Yellow oanlsi e sullonated acetoaoetic acid 4-nitro-2-amino-1-ph olfi-carbdx- Orange Yellow Greenish-yeilow anthranillde Elie stilriil and 81.11 on tion of the are yes What we claim is:

1. The herein described process for the manufacture of new dyestufis by treating the dyestuffs corresponding most probably with the general formula 2 wherein R stands for a nucleus of the henzene series carrying at least one nitro group and an OH group this latter being in ortho the general formula em 6-0 I Rx-N-dl-dL-H wherein R stands for a nucleus of the benaryl, with agents yielding chromium.

3. The herein described new dyestufi's contaming chromium which are compounds of the o-hydroxy dyestuffs corresponding most probably with the general formula:

wherein R stands for a nucleus of the hen-- taining chromium which are derivatives of.

the o-hydroxy dyestufl's corresponding most probably with the general formula:

OHs

wherein R stands for a nucleus of the benzene series carrying at least one nitro group and an OH group this latter being in ortho position to the azobridge, R meaning NH- aryl, which products form greenish-yellow to brownish-red and orange powders dissolving in water to yellow-orange and brown solutions and dyeing wool in an acid bath from yellow to orange and brown tints of excellent properties of fastness.

5. Material dyed with the dyestuffs of claim 3.

6, Material dyed with the dyestuffs of claim 4:.

In witness whereof we have hereunto signed our narnesthis 20th day of May 1925.

FRITZ STRAUB. GUILLAUME DE MONTMOLLIN. JOSEPH SPIELER. GHRISTOPI-I VON PLANTA. 

